Creating class instance from module and class name
Steven D'Aprano
steven at REMOVE.THIS.cybersource.com.au
Tue Oct 6 02:55:47 EDT 2009
On Mon, 05 Oct 2009 23:32:27 -0700, gentlestone wrote:
> Suppose I've saved the class name and (don't know how) I've also saved
> the Class's module (package path or I don't know what's the name for XYZ
> "from X.Y.Z import ...). How can I construct a new class according to
> saved informations? If I don't know what Class it could be, only I have
> the saved Class name?
If you have the module *object*, and the name of the class, then you can
do this:
theclass = getattr(module, "MyClass")
to get the class itself, and then call it as normal to instantiate it:
instance = theclass(args)
Classes are just like any other object in that regard.
If you have the *name* of the module, you can import it first to get the
module object:
module = __import__('module_name')
theclass = getattr(module, "MyClass")
instance = theclass(args)
There may be some complications if you have a dotted package name, in
which case the docs for __import__ are your friend :)
--
Steven
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